CENTREFOLD / Twin set: Portrait of Mado and Monette, by Raphael

'The twins were getting pissed off by the time I took this picture,' says the French photographer Raphael Gaillarde. 'I'd been trailing them like a paparrazzo, fascinated by the way they walked and interacted with each other.' Tailor-made for Gaillarde's brief, which was to reveal a new perspective on museum-going at the Louvre museum, Mado and Monette - seen here looking towards the Rubens gallery - eventually warmed to the photographer and went on to pose for further shots.

The series won second prize for Arts Stories in the 37th World Press Photo competition and can be seen with other prize-winning photographs at the National Theatre until 1 July. Widely recognised as the leading international photography competition, the World Press Photo attracts entries from publications in over 90 countries.

This is Gaillarde's kind of story - big, beautiful and totally involved. And if the logistics often prove obstructive - the Louvre, for example, initially resisted his demands for access and lighting arrangements - Gaillarde is hard to shake off. 'The more difficult it becomes,' he says, 'the more I want to do it.'

(Photograph omitted)